Introduction: Chronic fatigue syndrome is a heterogeneous disease associated with a vary of symptoms but with severe, prolonged fatigue as the core symptom associated with the disease. This is a condition characterized by an unreasonable sense of tiredness lasting over 6 months that cannot be explained by other conditions. In spite of more and more intensive research, the chronic fatigue syndrome is still insufficiently known and often overlooked in diagnostics. Aim: The intention of this article is to obtain and summarize current information about the diagnosis of chronic fatigue syndrome and also to increase the awareness of the problem in general medical practice. Materials and methods: The systematic literature search was perform...